Frequencies for first 10,000 rows of arr_hour variable in accident dataset :

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        288        2.88        2.88
          1 |        190        1.90        4.78
          2 |        198        1.98        6.76
          3 |        130        1.30        8.06
          4 |        118        1.18        9.24
          5 |        142        1.42       10.66
          6 |        180        1.80       12.46
          7 |        183        1.83       14.29
          8 |        141        1.41       15.70
          9 |        155        1.55       17.25
         10 |        158        1.58       18.83
         11 |        190        1.90       20.73
         12 |        192        1.92       22.65
         13 |        209        2.09       24.74
         14 |        255        2.55       27.29
         15 |        265        2.65       29.94
         16 |        267        2.67       32.61
         17 |        257        2.57       35.18
         18 |        271        2.71       37.89
         19 |        294        2.94       40.83
         20 |        251        2.51       43.34
         21 |        294        2.94       46.28
         22 |        234        2.34       48.62
         23 |        222        2.22       50.84
         24 |          2        0.02       50.86
         99 |      4,914       49.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016